"The dance-dramas are simple in theme yet impressive, and carry conviction. They are given as a form of religious instruction. Frightfully masked demons and devils triumphed over by gorgeously gowned saints are designed to dogmatize forcefully the almightiness of the [Buddhist] Church over man, beast, and spirit alike ."
Source of Descriptive Information
Harrison, F. (1936). Through forbidden Tibet: an adventure into the unknown. London: Jarrolds. (p.210-211).